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Characteristics of Cordierite-ZrO2 Composites Fabricated by The Multiphasic Sol-Gel Route

Published online by Cambridge University Press:  25 February 2011

Hyun M. Jang  and
Byung C. Lim
Hyun M. Jang
Affiliation:
Department of Materials Science and Engineering, and Advanced Ceramics Processing Science Laboratory, Pohang Institute of Science and Technology (POSTECH), Pohang 790-600, Republic of Korea
Byung C. Lim
Affiliation:
Department of Materials Science and Engineering, and Advanced Ceramics Processing Science Laboratory, Pohang Institute of Science and Technology (POSTECH), Pohang 790-600, Republic of Korea
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Abstract

Based on the electrokinetic properties of aqueous silica, boehmite, and ZrO2 dispersions, cordierite-ZrO2 composites were fabricated by the multiphasic sol-gel (or nanometer-scale sol mixing) route. The average particle sizes of boehmite and ZrO2 used in this study are 70 nm and 40 nm, respectively. The fabricated composites were characterized by a dense and homogeneous microstructure and by a uniform spatial distribution of submicron-sized tetragonal ZrO2 particles (200 nm) throughout the matrix. The microstructure of the matrix was represented by small-sized grains (< 400 nm) with a highly uniform grain-size distribution. The enhanced fracture toughness with increasing ZrO2 content was partly attributed to the martensitic t → m transformation. The formation of detrimental zircon (ZrSiO4) was avoided by suitably adjusting the heating schedule during sintering.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 286: Symposium J – Nanophase and Nanocomposite Materials , 1992 , 281
Copyright
Copyright © Materials Research Society 1993

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